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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Common pmac/prep/chrp pci routines. -- Cort
4 */
5
6#include <linux/kernel.h>
7#include <linux/pci.h>
8#include <linux/delay.h>
9#include <linux/string.h>
10#include <linux/init.h>
11#include <linux/capability.h>
12#include <linux/sched.h>
13#include <linux/errno.h>
14#include <linux/memblock.h>
15#include <linux/syscalls.h>
16#include <linux/irq.h>
17#include <linux/list.h>
18#include <linux/of.h>
19#include <linux/slab.h>
20#include <linux/export.h>
21
22#include <asm/processor.h>
23#include <asm/io.h>
24#include <asm/sections.h>
25#include <asm/pci-bridge.h>
26#include <asm/ppc-pci.h>
27#include <asm/byteorder.h>
28#include <linux/uaccess.h>
29#include <asm/machdep.h>
30
31#undef DEBUG
32
33unsigned long isa_io_base = 0;
34unsigned long pci_dram_offset = 0;
35int pcibios_assign_bus_offset = 1;
36EXPORT_SYMBOL(isa_io_base);
37EXPORT_SYMBOL(pci_dram_offset);
38
39static void fixup_cpc710_pci64(struct pci_dev* dev);
40
41/* By default, we don't re-assign bus numbers. We do this only on
42 * some pmacs
43 */
44static int pci_assign_all_buses;
45
46/* This will remain NULL for now, until isa-bridge.c is made common
47 * to both 32-bit and 64-bit.
48 */
49struct pci_dev *isa_bridge_pcidev;
50EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
51
52static void
53fixup_cpc710_pci64(struct pci_dev* dev)
54{
55 /* Hide the PCI64 BARs from the kernel as their content doesn't
56 * fit well in the resource management
57 */
58 dev->resource[0].start = dev->resource[0].end = 0;
59 dev->resource[0].flags = 0;
60 dev->resource[1].start = dev->resource[1].end = 0;
61 dev->resource[1].flags = 0;
62}
63DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
64
65#ifdef CONFIG_PPC_PCI_OF_BUS_MAP
66
67static u8* pci_to_OF_bus_map;
68static int pci_bus_count;
69
70/*
71 * Functions below are used on OpenFirmware machines.
72 */
73static void
74make_one_node_map(struct device_node* node, u8 pci_bus)
75{
76 const int *bus_range;
77 int len;
78
79 if (pci_bus >= pci_bus_count)
80 return;
81 bus_range = of_get_property(node, "bus-range", &len);
82 if (bus_range == NULL || len < 2 * sizeof(int)) {
83 printk(KERN_WARNING "Can't get bus-range for %pOF, "
84 "assuming it starts at 0\n", node);
85 pci_to_OF_bus_map[pci_bus] = 0;
86 } else
87 pci_to_OF_bus_map[pci_bus] = bus_range[0];
88
89 for_each_child_of_node(node, node) {
90 struct pci_dev* dev;
91 const unsigned int *class_code, *reg;
92
93 class_code = of_get_property(node, "class-code", NULL);
94 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
95 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
96 continue;
97 reg = of_get_property(node, "reg", NULL);
98 if (!reg)
99 continue;
100 dev = pci_get_domain_bus_and_slot(0, pci_bus,
101 ((reg[0] >> 8) & 0xff));
102 if (!dev || !dev->subordinate) {
103 pci_dev_put(dev);
104 continue;
105 }
106 make_one_node_map(node, dev->subordinate->number);
107 pci_dev_put(dev);
108 }
109}
110
111static void __init
112pcibios_make_OF_bus_map(void)
113{
114 int i;
115 struct pci_controller *hose, *tmp;
116 struct property *map_prop;
117 struct device_node *dn;
118
119 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
120 if (!pci_to_OF_bus_map) {
121 printk(KERN_ERR "Can't allocate OF bus map !\n");
122 return;
123 }
124
125 /* We fill the bus map with invalid values, that helps
126 * debugging.
127 */
128 for (i=0; i<pci_bus_count; i++)
129 pci_to_OF_bus_map[i] = 0xff;
130
131 /* For each hose, we begin searching bridges */
132 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
133 struct device_node* node = hose->dn;
134
135 if (!node)
136 continue;
137 make_one_node_map(node, hose->first_busno);
138 }
139 dn = of_find_node_by_path("/");
140 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
141 if (map_prop) {
142 BUG_ON(pci_bus_count > map_prop->length);
143 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
144 }
145 of_node_put(dn);
146#ifdef DEBUG
147 printk("PCI->OF bus map:\n");
148 for (i=0; i<pci_bus_count; i++) {
149 if (pci_to_OF_bus_map[i] == 0xff)
150 continue;
151 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
152 }
153#endif
154}
155#endif // CONFIG_PPC_PCI_OF_BUS_MAP
156
157
158#ifdef CONFIG_PPC_PMAC
159/*
160 * Returns the PCI device matching a given OF node
161 */
162int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
163{
164#ifdef CONFIG_PPC_PCI_OF_BUS_MAP
165 struct pci_dev *dev = NULL;
166#endif
167 const __be32 *reg;
168 int size;
169
170 /* Check if it might have a chance to be a PCI device */
171 if (!pci_find_hose_for_OF_device(node))
172 return -ENODEV;
173
174 reg = of_get_property(node, "reg", &size);
175 if (!reg || size < 5 * sizeof(u32))
176 return -ENODEV;
177
178 *bus = (be32_to_cpup(®[0]) >> 16) & 0xff;
179 *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff;
180
181#ifndef CONFIG_PPC_PCI_OF_BUS_MAP
182 return 0;
183#else
184 /* Ok, here we need some tweak. If we have already renumbered
185 * all busses, we can't rely on the OF bus number any more.
186 * the pci_to_OF_bus_map is not enough as several PCI busses
187 * may match the same OF bus number.
188 */
189 if (!pci_to_OF_bus_map)
190 return 0;
191
192 for_each_pci_dev(dev)
193 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
194 dev->devfn == *devfn) {
195 *bus = dev->bus->number;
196 pci_dev_put(dev);
197 return 0;
198 }
199
200 return -ENODEV;
201#endif // CONFIG_PPC_PCI_OF_BUS_MAP
202}
203EXPORT_SYMBOL(pci_device_from_OF_node);
204#endif
205
206#ifdef CONFIG_PPC_PCI_OF_BUS_MAP
207/* We create the "pci-OF-bus-map" property now so it appears in the
208 * /proc device tree
209 */
210void __init
211pci_create_OF_bus_map(void)
212{
213 struct property* of_prop;
214 struct device_node *dn;
215
216 of_prop = memblock_alloc(sizeof(struct property) + 256,
217 SMP_CACHE_BYTES);
218 if (!of_prop)
219 panic("%s: Failed to allocate %zu bytes\n", __func__,
220 sizeof(struct property) + 256);
221 dn = of_find_node_by_path("/");
222 if (dn) {
223 memset(of_prop, -1, sizeof(struct property) + 256);
224 of_prop->name = "pci-OF-bus-map";
225 of_prop->length = 256;
226 of_prop->value = &of_prop[1];
227 of_add_property(dn, of_prop);
228 of_node_put(dn);
229 }
230}
231#endif // CONFIG_PPC_PCI_OF_BUS_MAP
232
233void pcibios_setup_phb_io_space(struct pci_controller *hose)
234{
235 unsigned long io_offset;
236 struct resource *res = &hose->io_resource;
237
238 /* Fixup IO space offset */
239 io_offset = pcibios_io_space_offset(hose);
240 res->start += io_offset;
241 res->end += io_offset;
242}
243
244static int __init pcibios_init(void)
245{
246 struct pci_controller *hose, *tmp;
247#ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
248 int next_busno = 0;
249#endif
250
251 printk(KERN_INFO "PCI: Probing PCI hardware\n");
252
253#ifdef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
254 /*
255 * Enable PCI domains in /proc when PCI bus numbers are not unique
256 * across all PCI domains to prevent conflicts. And keep PCI domain 0
257 * backward compatible in /proc for video cards.
258 */
259 pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0);
260#endif
261
262 if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
263 pci_assign_all_buses = 1;
264
265 /* Scan all of the recorded PCI controllers. */
266 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
267#ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
268 if (pci_assign_all_buses)
269 hose->first_busno = next_busno;
270#endif
271 hose->last_busno = 0xff;
272 pcibios_scan_phb(hose);
273 pci_bus_add_devices(hose->bus);
274#ifndef CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
275 if (pci_assign_all_buses || next_busno <= hose->last_busno)
276 next_busno = hose->last_busno + pcibios_assign_bus_offset;
277#endif
278 }
279
280#if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP)
281#ifdef CONFIG_PPC_PCI_OF_BUS_MAP
282 pci_bus_count = next_busno;
283
284 /* OpenFirmware based machines need a map of OF bus
285 * numbers vs. kernel bus numbers since we may have to
286 * remap them.
287 */
288 if (pci_assign_all_buses)
289 pcibios_make_OF_bus_map();
290#endif
291#endif
292
293 /* Call common code to handle resource allocation */
294 pcibios_resource_survey();
295
296 /* Call machine dependent fixup */
297 if (ppc_md.pcibios_fixup)
298 ppc_md.pcibios_fixup();
299
300 /* Call machine dependent post-init code */
301 if (ppc_md.pcibios_after_init)
302 ppc_md.pcibios_after_init();
303
304 return 0;
305}
306
307subsys_initcall(pcibios_init);
308
309static struct pci_controller*
310pci_bus_to_hose(int bus)
311{
312 struct pci_controller *hose, *tmp;
313
314 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
315 if (bus >= hose->first_busno && bus <= hose->last_busno)
316 return hose;
317 return NULL;
318}
319
320/* Provide information on locations of various I/O regions in physical
321 * memory. Do this on a per-card basis so that we choose the right
322 * root bridge.
323 * Note that the returned IO or memory base is a physical address
324 */
325
326SYSCALL_DEFINE3(pciconfig_iobase, long, which,
327 unsigned long, bus, unsigned long, devfn)
328{
329 struct pci_controller* hose;
330 long result = -EOPNOTSUPP;
331
332 hose = pci_bus_to_hose(bus);
333 if (!hose)
334 return -ENODEV;
335
336 switch (which) {
337 case IOBASE_BRIDGE_NUMBER:
338 return (long)hose->first_busno;
339 case IOBASE_MEMORY:
340 return (long)hose->mem_offset[0];
341 case IOBASE_IO:
342 return (long)hose->io_base_phys;
343 case IOBASE_ISA_IO:
344 return (long)isa_io_base;
345 case IOBASE_ISA_MEM:
346 return (long)isa_mem_base;
347 }
348
349 return result;
350}
1/*
2 * Common pmac/prep/chrp pci routines. -- Cort
3 */
4
5#include <linux/kernel.h>
6#include <linux/pci.h>
7#include <linux/delay.h>
8#include <linux/string.h>
9#include <linux/init.h>
10#include <linux/capability.h>
11#include <linux/sched.h>
12#include <linux/errno.h>
13#include <linux/bootmem.h>
14#include <linux/irq.h>
15#include <linux/list.h>
16#include <linux/of.h>
17#include <linux/slab.h>
18
19#include <asm/processor.h>
20#include <asm/io.h>
21#include <asm/prom.h>
22#include <asm/sections.h>
23#include <asm/pci-bridge.h>
24#include <asm/ppc-pci.h>
25#include <asm/byteorder.h>
26#include <asm/uaccess.h>
27#include <asm/machdep.h>
28
29#undef DEBUG
30
31unsigned long isa_io_base = 0;
32unsigned long pci_dram_offset = 0;
33int pcibios_assign_bus_offset = 1;
34
35void pcibios_make_OF_bus_map(void);
36
37static void fixup_cpc710_pci64(struct pci_dev* dev);
38static u8* pci_to_OF_bus_map;
39
40/* By default, we don't re-assign bus numbers. We do this only on
41 * some pmacs
42 */
43static int pci_assign_all_buses;
44
45static int pci_bus_count;
46
47/* This will remain NULL for now, until isa-bridge.c is made common
48 * to both 32-bit and 64-bit.
49 */
50struct pci_dev *isa_bridge_pcidev;
51EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
52
53static void
54fixup_cpc710_pci64(struct pci_dev* dev)
55{
56 /* Hide the PCI64 BARs from the kernel as their content doesn't
57 * fit well in the resource management
58 */
59 dev->resource[0].start = dev->resource[0].end = 0;
60 dev->resource[0].flags = 0;
61 dev->resource[1].start = dev->resource[1].end = 0;
62 dev->resource[1].flags = 0;
63}
64DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
65
66/*
67 * Functions below are used on OpenFirmware machines.
68 */
69static void
70make_one_node_map(struct device_node* node, u8 pci_bus)
71{
72 const int *bus_range;
73 int len;
74
75 if (pci_bus >= pci_bus_count)
76 return;
77 bus_range = of_get_property(node, "bus-range", &len);
78 if (bus_range == NULL || len < 2 * sizeof(int)) {
79 printk(KERN_WARNING "Can't get bus-range for %s, "
80 "assuming it starts at 0\n", node->full_name);
81 pci_to_OF_bus_map[pci_bus] = 0;
82 } else
83 pci_to_OF_bus_map[pci_bus] = bus_range[0];
84
85 for_each_child_of_node(node, node) {
86 struct pci_dev* dev;
87 const unsigned int *class_code, *reg;
88
89 class_code = of_get_property(node, "class-code", NULL);
90 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
91 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
92 continue;
93 reg = of_get_property(node, "reg", NULL);
94 if (!reg)
95 continue;
96 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
97 if (!dev || !dev->subordinate) {
98 pci_dev_put(dev);
99 continue;
100 }
101 make_one_node_map(node, dev->subordinate->number);
102 pci_dev_put(dev);
103 }
104}
105
106void
107pcibios_make_OF_bus_map(void)
108{
109 int i;
110 struct pci_controller *hose, *tmp;
111 struct property *map_prop;
112 struct device_node *dn;
113
114 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
115 if (!pci_to_OF_bus_map) {
116 printk(KERN_ERR "Can't allocate OF bus map !\n");
117 return;
118 }
119
120 /* We fill the bus map with invalid values, that helps
121 * debugging.
122 */
123 for (i=0; i<pci_bus_count; i++)
124 pci_to_OF_bus_map[i] = 0xff;
125
126 /* For each hose, we begin searching bridges */
127 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
128 struct device_node* node = hose->dn;
129
130 if (!node)
131 continue;
132 make_one_node_map(node, hose->first_busno);
133 }
134 dn = of_find_node_by_path("/");
135 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
136 if (map_prop) {
137 BUG_ON(pci_bus_count > map_prop->length);
138 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
139 }
140 of_node_put(dn);
141#ifdef DEBUG
142 printk("PCI->OF bus map:\n");
143 for (i=0; i<pci_bus_count; i++) {
144 if (pci_to_OF_bus_map[i] == 0xff)
145 continue;
146 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
147 }
148#endif
149}
150
151
152/*
153 * Returns the PCI device matching a given OF node
154 */
155int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
156{
157 struct pci_dev *dev = NULL;
158 const __be32 *reg;
159 int size;
160
161 /* Check if it might have a chance to be a PCI device */
162 if (!pci_find_hose_for_OF_device(node))
163 return -ENODEV;
164
165 reg = of_get_property(node, "reg", &size);
166 if (!reg || size < 5 * sizeof(u32))
167 return -ENODEV;
168
169 *bus = (be32_to_cpup(®[0]) >> 16) & 0xff;
170 *devfn = (be32_to_cpup(®[0]) >> 8) & 0xff;
171
172 /* Ok, here we need some tweak. If we have already renumbered
173 * all busses, we can't rely on the OF bus number any more.
174 * the pci_to_OF_bus_map is not enough as several PCI busses
175 * may match the same OF bus number.
176 */
177 if (!pci_to_OF_bus_map)
178 return 0;
179
180 for_each_pci_dev(dev)
181 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
182 dev->devfn == *devfn) {
183 *bus = dev->bus->number;
184 pci_dev_put(dev);
185 return 0;
186 }
187
188 return -ENODEV;
189}
190EXPORT_SYMBOL(pci_device_from_OF_node);
191
192/* We create the "pci-OF-bus-map" property now so it appears in the
193 * /proc device tree
194 */
195void __init
196pci_create_OF_bus_map(void)
197{
198 struct property* of_prop;
199 struct device_node *dn;
200
201 of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
202 if (!of_prop)
203 return;
204 dn = of_find_node_by_path("/");
205 if (dn) {
206 memset(of_prop, -1, sizeof(struct property) + 256);
207 of_prop->name = "pci-OF-bus-map";
208 of_prop->length = 256;
209 of_prop->value = &of_prop[1];
210 prom_add_property(dn, of_prop);
211 of_node_put(dn);
212 }
213}
214
215void __devinit pcibios_setup_phb_io_space(struct pci_controller *hose)
216{
217 unsigned long io_offset;
218 struct resource *res = &hose->io_resource;
219
220 /* Fixup IO space offset */
221 io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
222 res->start = (res->start + io_offset) & 0xffffffffu;
223 res->end = (res->end + io_offset) & 0xffffffffu;
224}
225
226static int __init pcibios_init(void)
227{
228 struct pci_controller *hose, *tmp;
229 int next_busno = 0;
230
231 printk(KERN_INFO "PCI: Probing PCI hardware\n");
232
233 if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
234 pci_assign_all_buses = 1;
235
236 /* Scan all of the recorded PCI controllers. */
237 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
238 if (pci_assign_all_buses)
239 hose->first_busno = next_busno;
240 hose->last_busno = 0xff;
241 pcibios_scan_phb(hose);
242 pci_bus_add_devices(hose->bus);
243 if (pci_assign_all_buses || next_busno <= hose->last_busno)
244 next_busno = hose->last_busno + pcibios_assign_bus_offset;
245 }
246 pci_bus_count = next_busno;
247
248 /* OpenFirmware based machines need a map of OF bus
249 * numbers vs. kernel bus numbers since we may have to
250 * remap them.
251 */
252 if (pci_assign_all_buses)
253 pcibios_make_OF_bus_map();
254
255 /* Call common code to handle resource allocation */
256 pcibios_resource_survey();
257
258 /* Call machine dependent post-init code */
259 if (ppc_md.pcibios_after_init)
260 ppc_md.pcibios_after_init();
261
262 return 0;
263}
264
265subsys_initcall(pcibios_init);
266
267static struct pci_controller*
268pci_bus_to_hose(int bus)
269{
270 struct pci_controller *hose, *tmp;
271
272 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
273 if (bus >= hose->first_busno && bus <= hose->last_busno)
274 return hose;
275 return NULL;
276}
277
278/* Provide information on locations of various I/O regions in physical
279 * memory. Do this on a per-card basis so that we choose the right
280 * root bridge.
281 * Note that the returned IO or memory base is a physical address
282 */
283
284long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
285{
286 struct pci_controller* hose;
287 long result = -EOPNOTSUPP;
288
289 hose = pci_bus_to_hose(bus);
290 if (!hose)
291 return -ENODEV;
292
293 switch (which) {
294 case IOBASE_BRIDGE_NUMBER:
295 return (long)hose->first_busno;
296 case IOBASE_MEMORY:
297 return (long)hose->pci_mem_offset;
298 case IOBASE_IO:
299 return (long)hose->io_base_phys;
300 case IOBASE_ISA_IO:
301 return (long)isa_io_base;
302 case IOBASE_ISA_MEM:
303 return (long)isa_mem_base;
304 }
305
306 return result;
307}
308
309